Skip to content
New issue

Have a question about this project? # for a free GitHub account to open an issue and contact its maintainers and the community.

#

By clicking “#”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? # to your account

Don't allow update_into to mutate immutable objects #8230

Merged
merged 1 commit into from
Feb 7, 2023
+9 −1
Merged

Don't allow update_into to mutate immutable objects #8230

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion src/cryptography/hazmat/backends/openssl/ciphers.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -156,7 +156,7 @@ def update_into(self, data: bytes, buf: bytes) -> int:
data_processed = 0
total_out = 0
outlen = self._backend._ffi.new("int *")
baseoutbuf = self._backend._ffi.from_buffer(buf)
baseoutbuf = self._backend._ffi.from_buffer(buf, require_writable=True)
baseinbuf = self._backend._ffi.from_buffer(data)

while data_processed != total_data_len:
Expand Down
8 changes: 8 additions & 0 deletions tests/hazmat/primitives/test_ciphers.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -318,6 +318,14 @@ def test_update_into_buffer_too_small(self, backend):
with pytest.raises(ValueError):
encryptor.update_into(b"testing", buf)

def test_update_into_immutable(self, backend):
key = b"\x00" * 16
c = ciphers.Cipher(AES(key), modes.ECB(), backend)
encryptor = c.encryptor()
buf = b"\x00" * 32
with pytest.raises((TypeError, BufferError)):
encryptor.update_into(b"testing", buf)

@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
AES(b"\x00" * 16), modes.GCM(b"\x00" * 12)
Expand Down